Površinska svojstva koloidnih čestica anatasa

master's thesis

• Title (english): Surface properties of anatase colloid particles
• Author: Mateja Prpić
• Mentor: Tajana Begović (mentor)
• Committee member: Tajana Begović (predsjednik povjerenstva)
• Committee member: Marina Cindrić (član povjerenstva)
• Committee member: Iva Juranović Cindrić (član povjerenstva)
• Committee member: Davor Kovačević (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Chemistry); Zagreb
• Defense date and country: 2022-02-18, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

U sklopu ovog diplomskog rada okarakterizirane su koloidne čestice anatasa te su ispitana
međupovršinska svojstva titanijev(IV) oksid / vodena otopina elektrolita. Kao elektrolit je
korišten natrijev klorid. Radi onečišćenja ishodnih uzoraka, prije mjerenja je provedeno
čišćenje čestica. Za karakterizaciju čestica korišteno je nekoliko metoda. Potenciometrijskom
masenom titracijom određena je točka nul-naboja. Potenciometrijskom kiselinsko-baznom
titracijom određene su relativna površinska gustoća naboja i točka nul-naboja. Izoelektrična
točka određena je metodom elektroforeze. Dobiveni podaci o izoelektričnoj točki i točki nulnaboja ukazali su na bolje vezanje natrijevih kationa na površinu čestica i zaostajanje kloridnih
aniona u otopini. Veličina čestica te njihova raspodjela određene su dinamičkim i statičkim
raspršenjem svjetlosti. Mjerenja su provedena na česticama različitih veličina te su rezultati
međusobno uspoređeni.

Abstract (english)

For the purpose of this paper, colloidal anatas particles were described and the interfacial
properties of titanium(IV) oxide / aqueous electrolyte solution were investigated. Sodium
chloride was used as the electrolyte. Due to the contamination of the starting samples, particle
cleaning was performed before the measurement. Several methods were used to characterize
particles. Zero-charge point was determined by potentiometric mass titration. By potentiometric
acid-base titration the relative surface charge density and the zero-charge point were
determined. The isoelectric point was determined by electrophoresis. The obtained data on the
isoelectric point and the zero-charge point indicated better binding of sodium cations to the
surface of the particles and the lagging of chloride anions in the solution. Particle size and
distribution were determined by dynamic and static light scattering. Measurements were
performed on particles of different sizes and the results were compared with each other

• Keywords: električni međupovršinski sloj; izoelektrična točka; koloidni sustav; nanočestice; površinska gustoća naboja; titanijev(IV) oksid; točka nul-naboja
• Keywords (english): colloid system; electrical interfacial layer; isoelectric point; nanoparticles; point of zero charge; surface charge density; titanium(IV) oxide
• Language: croatian
• URN:NBN: urn:nbn:hr:217:581451
• Project: Number: IP-2020-02-9571; Title: Fizikalna kemija procesa na međupovršini mineral/otopina (poli)elektrolita; Title: Physical chemistry of processes at mineral/(poly)electrolyte solution interface; Acronym: POLYMIN2; Leader: Tajana Begović; Jurisdiction: Croatia; Funder: HRZZ; Funding stream: IP
• Study programme: Title: Graduate university studies in chemistry; specializations in: Research programme; Course: Research programme; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra kemije (magistar/magistra kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-02-23 13:28:19